(meteorobs) Chelyabinsk event - what was precise time? Any radiodata?

[James Beauchamp]

For VLF, I don't think there would be a discernible emission.  Maybe some exotic signals if it was able to compress enough of our magnetic field.  

But I think you can assume it was a large-scale overdense ion event, creating an antenna a couple of hundred kilometers long. It could have  made bi-static disturbances detectable by receivers listening to established beacon frequencies.  

--- On Sun, 3/31/13, drobnock <drobnock at penn.com> wrote:

> From: drobnock <drobnock at penn.com>
> Subject: (meteorobs) Chelyabinsk event - what was precise time? Any radiodata?
> To: "Thomas Ashcraft" <ashcraft at heliotown.com>, "meteorobs at meteorobs.org" <meteorobs at meteorobs.org>
> Date: Sunday, March 31, 2013, 8:00 PM
>  (meteorobs) Chelyabinsk event - what
> was precise time? Any radiodata?
> Thomas,
> Not certain if this site was referenced to you about the
> Chelyabinsk
> Event:
> http://www.iris.edu/hq/news/story/waves_generated_by_russian_meteor_detected_crossing_the_us
> 
> IRIS (Incorporated Research Institutions for Seismology)
> presented this
> information: "The Chelyabinsk meteor exploded in the
> atmosphere at
> approximately 03:20 GMT (9:20 AM local time) on February 15.
> The
> pressure wave from the blast caused significant damage in
> the city,
> breaking thousands of windows and injuring more than 1000
> people. The
> energy from the blast created pressure waves in the
> atmosphere that
> rapidly moved outward from the terminal burst and spread
> around the
> globe. The downward directed blast coupled into the ground
> and spread
> outward as a seismic wave in the Earth. These two waves –
> the seismic
> wave in the Earth and the pressure wave in the atmosphere
> – travel at
> very different speeds. The waves in the ground travel
> quickly – at about
> 3.4 km per second – and attenuate rapidly, whereas the
> waves in the
> atmosphere are much slower (~0.3 km per second) and can
> travel great
> distances."
> 
> This report a PDF shows the detected pressure waves to North
> America:
> http://www.iris.edu/hq/files/Russian_Meteor_02262013.pdf
> 
> I was expecting European VLF stations to detect a signature
> at the time
> of the event. As I presented to you, the Tunguska Event
> was  of similar
> power and at the time receivers, ever so simple,  were
> in operation but
> there was never any mention of a strange signature on the
> day of the
> event.
> Hope this helps.
> George John Drobnock
> 
> 
> 
> Does anyone know the precise timings of the Chelyabinsk
> meteor strike?
> General timing was at 03:20 UTC on February 15, 2013.
> 
> When did the ionization begin? Was there a radio meteor
> signature
> seconds before it became visible? Are there any VHF forward
> scatter
> captures?
> 
> It appears that the strike was recorded very well in
> infrasound all
> around the globe.
> 
> Is there any evidence of the strike in ULF or ELF or VLF
> radio data
> anywhere in the world?
> 
> Any info welcome!  Thank you in advance.
> 
> Thomas Ashcraft  -  Heliotown  -  New
> Mexico
> 
> 
> 
> 
> 
> _______________________________________________
> meteorobs mailing list
> meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>